A solid black dog is either recessive black (a/a) or dominant black (Kb), additionally B-, D- (no dilute) and E/E (no recessive red). The K-locus is known for dominant black coat colour and will suppress the a-locus in showing its phenotypically traits. If a dogs genotype contains at least one copy of Kb, the dog will express its basic coat colour, according to the B-, D- and E- locus alleles. The spotting gene will show it’s white markings also on dominant black coat.
Brown (Liver/chocolate): Only if a dog is homozygous for brown (b/b) black pigment will be diluted to brown. If homozygous for dilute as well (d/d) then brown will become isabella/lilac.
Blue: The D-Locus dilutes the dogs coat colours and has effect on skin and eye colour too if the dog is homozygous for d/d. Black will appear as grey/blue and red pigment will be reduced to cream/gold.
Recessive red/yellow/white: The E allele will give the hair it’s black pigment, while the e allele will reduce eumelanin to red or yellow. If homozygous for e/e the coat colour will vary from orange, yellow to clean white.